JPH08253233A - Corrugated cardboard box equipped with reinforced corner parts - Google Patents

Abstract

PURPOSE: To provide a corrugated cardboard box equipped with reinforced corner parts not torn or collapsed even when the box is let fall so as to impinge against a floor surface from the corner parts thereof. CONSTITUTION: The root parts of respective adjacent lid pieces are integrally connected through the folds C of connection parts and separation slits 4 extending toward the folds A of the lid pieces from the upper ends of the folds C of both side ends in an obliquely downward direction in an opposed state to form the corner part connection pieces 5 surrounded by the folds A, C, 4 and folds D for folding double are provided to the connection pieces. If necessary, it is pref. to form the corner part connection pieces 5 even to bottom pieces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated cardboard box having a reinforced corner portion, which is suitable for packing, for example, a personal computer and various other electric devices.

[0002]

2. Description of the Related Art When a cardboard box is used to package a shock-sensitive packaged article, a particular problem is that when the cardboard box falls from its corners so as to hit the floor, The concentrated load applied may damage the corners of the box and damage the packaged item. As one of the measures for improving this problem, conventionally, a method of embedding a plastic reinforcing band in a headband shape near the upper end (and the lower end) of the peripheral wall of the box has been adopted. Further, a method has also been practiced in which a lid (bottom) piece is laid across a side wall of a box, an adhesive tape for packing is attached, and at the same time when the lid is closed, the structural strength of the box is increased. Alternatively, JP-A-2-242735
The publication discloses a method of providing a reinforcing structure similar to a "brace" of a building at the four corners of the folding cardboard box on the lid side. This technique, by forming diagonal cuts on the bases of both ends of each lid piece, the triangular piece that becomes a brace,
It is formed so as to be separable from the lid piece, and when the lid is closed, two adjacent triangular pieces at each corner portion of the box are laminated in a superposed manner.

[0003]

However, the method of embedding a reinforcing band in a predetermined portion of a corrugated cardboard used as a material of a box requires a corrugated board manufacturing machine equipped with an auxiliary equipment for embedding, so that the small and medium size It was difficult for this processor to adopt.
In addition, since the reinforcing band is embedded, the manufacturing cost of the corrugated board increases. Further, the method of attaching the adhesive tape is troublesome and the reinforcing effect is not always sufficient. In the case of JP-A-2-242735, when the lid is closed, the inefficient extra work of attaching the triangular pieces at the four corners one by one is necessary, and the used box cannot be easily crushed. Therefore, an object of the present invention is to provide a reinforced corner portion that makes it possible to reinforce this box as easily and surely as possible in case the box is dropped off from the corner portion first. It is to provide a cardboard box.

[0004]

In order to achieve the above object, a corrugated cardboard box having a reinforcing corner portion according to the present invention has a lid piece 2A-2 on each of the upper and lower sides of four side walls 1A-1D.
In the foldable type in which D and the bottom pieces 3A to 3D are connected to each other through the folds A and B, respectively, with the adjacent lid pieces and the bottom pieces separated from each other, each of the adjacent lid pieces Root portions of the above are integrally connected via a connecting portion fold line C, and one facing lid piece is diagonally opposed to the fold line A from the upper end of the connecting portion fold line C at each side end. By providing the separating cut 4 extending downward, the corner connecting piece 5 surrounded by the connecting portion fold C, the separating cut 4 and the fold A is formed, and the corner connecting piece 5 is formed. The folding fold D for connecting the box corner and the central portion of the separation cut 4 is provided. Then, if necessary, the corner connecting piece 5 is also provided on one of the opposing bottom pieces.
Should be formed respectively. In addition, a cut 11 and a fold F for projecting the handle piece 10 toward the inside of the box are provided in the middle of one of the opposing side walls, and a rectangular corrugated board is cut across the inner wall surface of the corrugated board box. A pair of reinforcing side walls 12 and 12 bent in a U-shape are attached to the handle piece 1.
It is advisable to add them in a state of being separated from each other by 0.

[0005]

When the lid of the cardboard box is closed, first, one of the facing lid pieces (2A, 2C) on the side having the separation cut 4 is closed. At this time, the corner-portion connecting pieces 5 provided at the root portions on both ends thereof are left unfolded. Then
When the other facing lid piece (2B, 2D) is closed, each corner connecting piece 5 is naturally folded inward along the fold line D for folding, so that the lid can be closed without any trouble. Unlike the conventional one, in the state where each lid piece is closed, unlike the conventional one, the root portions of the adjacent lid pieces are integrally connected via the corner connecting pieces 5. Of course, each corner connecting piece 5 is folded into two layers. Therefore, this corner connecting piece 5 acts as if it were a "brace" of a building to reinforce the corner of the box, and the wall thickness of the corner increases, so that the deformation resistance or Has a much higher impact strength than conventional cardboard boxes.

If the corner-portion connecting piece 5 is formed on one of the opposing bottom pieces and placed, the structural strength of each corner portion on the bottom side of the corrugated board box can be similarly enhanced. In addition, as shown in FIG. 2, on one of the opposing side walls (1A, 1C), the handle pieces 10 are provided so as to project toward the inside of the box, and a pair of sets is provided on both sides thereof. If the reinforcing side walls 12 and 12 are attached to the inner wall surface of the box, the entire box including the corners is further reinforced.
Moreover, it does not hinder the insertion of the hand into the handle hole, and the side wall for reinforcement 1
It also saves 2 materials.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The foldable corrugated board box 200 of this embodiment shown in FIGS. 2 to 4 is assembled from the single corrugated board 100 shown in FIG. 1 in which folds and cuts are provided at predetermined plural positions.

The cardboard 100 is a cardboard box 200.
The lid pieces 2A to 2D and the bottom pieces 3A to 3D are connected to the upper and lower sides of the side walls 1A to 1D forming the peripheral wall via the folds A and B, respectively. 1E is
It is a piece of glue.

Unlike the conventional corrugated cardboard boxes, one of the opposing lid pieces 2A, 2C has a lid piece 2B, which is adjacent to both sides of each of them.
Without being completely separated from 2D, the root portions of both side ends are left uncut, and are integrally connected via the connecting portion fold line C. Further, in the facing lid pieces 2A and 2C, a pair of 1/4 arc-shaped separating cuts 4, which extend in opposite directions from the respective upper ends of the connecting portion folds C at both ends toward the fold A of the lid piece 4, 4 are provided respectively. As a result, at the root portions (corner portions) of both side ends of each of the lid pieces 2A and 2C, the fold C surrounded by the connecting portion fold C, the separation cut 4, and the fold A is 1/4.
Circular corner connecting pieces 5 and 5 are respectively formed.

The corner connecting piece 5 is provided with a folding fold D for folding in two, which extends from the corner of the box toward the center of the separating slit 4. The two-fold fold D is provided with an I-shaped fold cut (not shown), leaving both ends thereof. As a result, the corner connecting piece 5 has a crease that is folded inward toward the inside of the box. Perforations or half-cut lines may be provided instead of the breaks.

Furthermore, one pair of insertion holes 6 and 6 in the form of elongated trapezoids for inserting the tip portions of the other opposing lid pieces 2B and 2D into one of the opposing lid pieces 2A and 2C, They are provided at positions near both ends of the lid piece.

On the other opposing lid pieces 2B and 2D, insertion projections 7 to be inserted into the insertion holes 6 are provided on both sides of the upper edge portion, respectively. Further, semicircular finger-hanging notches 8 and 8 are provided on the left and right side edge portions of the facing lid pieces 2B and 2D near the lower ends thereof. A fold line E for insertion that is bent inward of the box is provided between the notches 8 and 8. A small notch (not shown) for preventing cracks is provided at the base of the insertion projection 7.

Further, a horizontal crease F having a predetermined length is formed at a substantially middle portion of one of the opposing side walls 1A and 1C so as to project a grip piece 10 inwardly of the box in a cut-and-raised manner, and at both ends thereof. A continuous C-shaped cut 11 is provided.

Reference numerals 12 and 12 shown in FIGS. 2 and 5 are a pair of reinforcing side walls and are attached to the inner wall surface of the corrugated board box 200 as shown in FIG. It plays the role of further increasing the structural strength. The reinforcing side wall 12 made of rectangular corrugated board of this embodiment is bent in a gutter shape having a U-shaped cross section along two parallel folds G at the time of use. The pair of reinforcing side walls 12 and 12 are fitted in the corrugated cardboard box in a state of being separated on both sides of the handle pieces 10 and 10 which also play the role of separators.

Next, the operation of the above configuration will be described. The left and right ends of the corrugated board 100 are connected to each other in a rectangular tube shape through the glue strips 1E and are flatly crushed to complete the folded corrugated board box 200. To pack an article using this cardboard box 200, first, the product is developed into a rectangular tube shape, and then the bottom pieces 3A to 3D are folded inward to form the bottom of the box. Then, as shown in FIG. 2, on the inner wall surface of the box,
When the reinforcing side walls 12 and 12 are added as described above, the entire corrugated board box 200 is reinforced including the corner portions of the box.

Therefore, a packing article (neither of which is shown) is stored in the box by using the cushioning packing, and first, as shown in FIG. 3, one of the opposed lid pieces 2A and 2C is closed.
At this time, each corner connecting piece 5 is left unfolded in a state of being connected to the other opposing lid pieces 2B and 2D without being bent.

Next, as shown in FIG. 4, when the other opposing lid pieces 2B and 2D are also closed, each corner portion which receives a compressive force in the plane direction due to this bending movement. Connecting piece 5
Is naturally folded inward along the fold line D for folding. Therefore, the lid pieces 2B and 2D can be closed without any trouble.

During this lid closing operation, the lid pieces 2B and 2D are
By bending it downwards along the insertion fold line E,
The insertion projections 7 are smoothly inserted into the corresponding insertion holes 6 to fix the lid closed state of each of the lid pieces 2A to 2D.

In the cardboard box 200 that has been packed, when the handle piece 10 is pushed with a finger, the reinforcing side wall 12 is not attached to this portion, so that the handle piece 10 is cut and raised inside the box. Can be projected.

By the way, during transportation of the cardboard box 200,
If, by accident, the box is upside down and the box corner is hit against the floor, a very large concentrated load will be applied to the corner. However, unlike the conventional cardboard box 200, the adjacent lid pieces 2A to 2D are not completely separated from each other, and the corner connecting piece 5 is provided at the corner of the box. Are connected to each other via. Of course, the corner connecting piece 5 is folded in two when the lid is closed.

Therefore, in each of the corners on the lid side of the cardboard box 200, the corner connecting piece 5 plays a role as if it were a "brace" of a building. As a result, the structural strength and / or impact resistance of the corners of the box are significantly enhanced compared to conventional corrugated cardboard boxes. Therefore, even if a large impact force is accidentally applied to the corner portion while handling the cardboard box, there is almost no risk of tearing this portion or crushing the corner portion and damaging the packed article. Lost.

In the above structure, the object of the present invention can be achieved even if the detailed structure is appropriately changed. For example, the shape and size of the corner-portion connecting piece 5 are appropriately determined based on experimental data by trial and error so as to best fit the size and material of each cardboard box, the type of packaged article, and the like. Good. If necessary, the corner connecting piece 5 may be provided on the bottom piece side of the cardboard box.

[0023]

As is clear from the above description, the corrugated cardboard box having the reinforced corner portions according to the present invention has excellent practical effects as listed below. (A) Unlike the conventional one in which a reinforcing band is embedded in a corrugated cardboard, no facility for embedding is required, so that it can be easily adopted by small and medium-sized processors. (B) Also, the cost of corrugated board is not increased by embedding the reinforcing band, and the reinforcing effect itself is superior to this method. (C) Since it suffices to change the way in which the cuts and folds are provided on the corrugated cardboard used as the material of the box, almost no extra cost is required for constructing the corners as a reinforcing structure. (D) Since the reinforcing structure of the corner portion is naturally formed during the packaging process of the box, unlike the conventional method of reinforcing with the adhesive tape or the like, no extra labor and cost are required. (E) If the inner wall surface of the box is provided with a reinforcing side wall formed by bending a corrugated cardboard into a U-shaped cross section, the structural strength of the entire box including the corners can be further increased. (F) Since the reinforcing side wall is separately arranged on both sides of the handle piece, it does not interfere with inserting the hand into the handle hole, and the material of the reinforcing side wall can be saved.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a plan view of a state in which it is developed on one cardboard.

FIG. 2 is a perspective view of the cardboard box with the lid open, as above.

FIG. 3 is a perspective view showing a state in which one of the opposing lid pieces is closed.

FIG. 4 is a perspective view showing a state in which the other opposing lid piece is closing as well.

FIG. 5 is a development view of the reinforcing side wall of the same.

[Explanation of symbols]

 100 Corrugated board 200 Cardboard box 1A-1D Side wall 1E Adhesive margin piece 2A-2D Lid piece 3A-3D Bottom piece 4 Separation cut 5 Corner corner connecting piece 6 Insertion hole 7 Insertion projection 8 Cutout 10 Handle piece 11 Cut 12 Reinforcement side wall A, B, F, G Fold fold C Connecting part fold D Double fold fold E Insertion fold

Claims (3)

[Claims] 1. Lid pieces 2A to 2D and bottom pieces 3A to 3D are provided on the upper and lower sides of four side walls 1A to 1D, respectively, with each of the adjacent lid pieces and bottom pieces separated from each other, and folds A and In the foldable type continuously connected via B, the base parts of the adjacent lid pieces are connected to each other by the fold line C
And one of the opposing lid pieces is provided with a separation cut 4 extending diagonally downward from the upper end of the connecting portion fold C at each of both ends toward the fold A. To form the corner connecting piece 5 surrounded by the connecting portion fold C, the separating cut 4 and the fold A, respectively, and the corner connecting piece 5 includes the box corner and the separating cut. Four
A corrugated cardboard box having a reinforcing corner portion, which is provided with a fold line D for folding in two that connects the center part of the box. 2. The corrugated cardboard box with a reinforced corner portion according to claim 1, wherein the corner portion connecting piece 5 is also formed on one of the opposing bottom pieces. 3. A cut 11 is formed in the middle of one of the opposing side walls so that a handle piece 10 is formed in a raised shape so as to project toward the inside of the box.
And a fold F, and a pair of reinforcing side walls 12 and 12 formed by bending a rectangular corrugated cardboard into a U-shaped cross section on the inner wall surface of the corrugated cardboard box, separated from each other by the handle piece 10. A corrugated cardboard box having a reinforced corner portion according to claim 1 or 2, wherein the corrugated cardboard box is provided together.